Teenths to geoege judge



' (No Model.)

W. H. SNELSON PULLEY SHBAVE.

Patented VFeb.?24, 1885.

ll'NrTnn STATES WILLIAM` II. sNLLsoN, or cHIoAGo,

PATnNT Ormea.

ILLINOIS, ASSIGNOR-OF SEVEN-SIX- TEENTHS TO GEORGE JUDGE, OF SAME PLAGE.

SPECIFICATION forming part of Letters Patent No. 312,668, dated February24, 1885.

n Applicatioulcd July 1, 1854. (No model.)

To @ZZ whom. t may concern..-

Be it known that I, WILLIAM H. SNELsoN, of Chicago, county of Cook,andStateof Illinois, have invented certain' new and useful Improvementsin a Pulley-Sheave, of which the following is a full, clear, and exactdescription, that will enable others to make and use the saine,reference being had to the accompanying drawings, forming a part of thisspecification.

This invention relates more especially to improvements in that class vofsheaves having a grooved periphery for the purpose of adapting the sameto carry the wire rope employed in the cable traction system for movingstreetcars. It is also obvious that a' pulley or sheave of thischaracter may be used for various purposes.

-The object is to provide a carrying pulley or sheave that will reducethe f'riction and lessen the wear on both the cable and sheave, and alsoprevent the face or cable-bearing surface of sheave being affected bycorrosion, as the sheaves used in street-car service are usually placedbelow the level -of the ground surface, and are as a matter of coursemore or less in the water.

The nature of Athis invention consists in forming the body of the pulleyor sheave of glass, which is properly supported and clamped betweenmetallic anges. It also consists of certain novel features in theconstruction and manner of securing the different parts together, aswill be hereinafter more fully set forth in detail.

Figure 1 is a side elevation of a pulley or sheave embodying myimprovedfeatures, Eig. 2, a partial transverse section of the same. Figs. 3, 4,and 5 are modifications.

Referring to the drawings, AA represent the inclosing danges or sides, Bthe arms, C the hub, and D the glass body. The body D is composed ofglass, and ordinarily has beveled sides, as shown in Fig. 2, thebroadest or base part resting on the annular rim a,which is cast on theends of the spider-arms B, together' with the one side flange, A, thecompanion flange, A', being formed independent and detachably secured inrelation to the other parts. Theinclosing-tlanges A A are beveled on theinner faces to correspond to the body D. The body D is provided on theperiphery with the annular groove a', for the reception of the cable.For small sheaves the glass body or center will usually be formed as aVwhole; but for large sheaves or pulleys practical working may requirethe same to be prepared in segmental sections. This form of constructionwill also facilitate repairs and be more economical, asa fracturedsegment can be convenientlyreplaced by another without having to replacethe body as a whole.

The detachable or loose flange Ais secured in position with relation tothe other parts by means of the series of screw-bolts E, which passthrough the glass body, the threaded ends engaging with thecorrespondingly-threaded apertures al in the iiange A', while theopposite or headed ends are countersunk in the companion flange, A. Bythis arrangement all the parts are securely and firmly clamped together,leaving no projecting bolt ends or nuts to be in the way, and alsoreadily permitting of the structure being taken apart for repairs. Theflange A is also provided with the annulargroove a3, which receives andengages with the edge of the rim a, and serves to assist instrengthening and in retaining these parts in their proper relativeposition.

The series oi' openings c1 in the iianges A A provide means for keepingthe sheaves in balance by simply filling the saine with lead or somesuitable plastic substance that is easily inserted or removed, as may berequired. These openings are gradually contracted outward from theinnersides of the iianges, as shown 4in Fig. 3, whereby the filling ismore surely retained.

- The angular extended ledges b b on the flanges A A serve to guardagainst the liability of the cable getting off the sheaves. Thecontacting surfaces ol' the glass and metal will be covered with whitelead or some similar substance, for the purpose of forming tight jointsand excluding the moisture.

rlhe modification, Fig. 3, shows a double pulley or sheave, the glassbody being provided with two grooves, the metallic flanges or inclosingsides having independent hubs. In this case the contacting surfaces ofthe flanges and glass body are straight instead of beveled, and areclamped together by screw- IOO v composition.

bolts, as already described. The glass body is provided on each sidewith the annular projecting bead d, which engages with correspondinggrooves inthe inclosing-langes.

Fig. 4 shotvs the glass body with annular shoulders d,theinclosing-iianges having beads engaging with said shoulders for thepurpose of assisting in retaining these parts together.

Fig. 5 shows a sheave or pulley wholly of glass, which may be rigidlysecured to its shaft by the use of sulphur or other suitable cement It'the pulley is required to rotate loosely on a stationary shaft, the eyethrough the pulley should be bushed with Babbitt metal or other materialthat will provide a suitable bearing. This pulley is provided on itsperiphery or face with the usual carrying-groove, the face slopinginward toward said groove, so that the cable will not be so likelytojurnp off. This pulley is also provided on each side With the annulargrooves di di, which in turn are provided at regular intervals with thecupped-out cavities or recesses di. (Indicated by the dotted lines.)`These cavities may be of any particular shape7 and are designed toreceive and hold some substance to retain the pulley in proper balance.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. A pulley-sheave having a body and bearing-face composed Wholly ofglass7 substantially as described.

2. A pulley-sheave consisting of the hub C, the arms B, the rim a, therigid iiange A, the glass body D, the detachable iiange A', providedwith the annular groove a, and the clamping screw-bolts E, substantiallyas described.

3. A pulley-sheave having the sides or' .to

